Calculating Standard Deviation (elevation) of the Points of Road Network to find River Location

[SmAsaduzzamanReshad]

Hi

I have lines of road network(more than 20,000 individual lines). I have converted the lines to points and assigned elevation(raster value from DEM) to those points. I have calculated the distance of points along the lines using "Locate Feature Along Routes" (coordinate priority=upper left corner). Now I would like to consider the the 10 points window to calculate the standard deviation of those 10 points on the line and find the river location according to  values of standard deviation. As the raster value decreases in the river so there will be higher standard deviation as we move towards the river.  How can I do it?

Is there any other way to solve this?? 

Thank you